Synonym for slut, but not the same. A slut is obvious. A tramp is a slut disguised as a lady. This makes her much more dangerous. A tramp is a woman who will seem to be everything you've dreamed of in a woman and will make you feel like the only guy in the world...

...just like the last guy, and just before - sometimes SHORTLY before - the next one.

"We spent nearly every day together for two months, then she goes and screws my COWORKER. Can you believe this fucking tramp?"